Internal-combustion engine



Apnl 1927' E. R. BURTNETT INTERNAL COMBUSTION ENGINE Filed Nov. 22. 1923Patented Apr. 5, 1927.

' EVERETT Rf. BURTNETT} OF LOS' ANGELES,

FORNIAQ r VOL'U'N-TARY- TRUST. V

mcrtamrngcolvrsusmibw Enema:

Appiicamh filed itoirembr tion'f engines of the general type di'selbse'din my'c'o p'ending application tor SL'Letters- Patent fiIeCTJanua'ryA;1923; Serial N0.

The principal'object bf iny" present "invert tion 'is to I generallyimprove upon and-'- simplify the construction of i the intention:disclosed in my "application aforesa d and; to provide an engine ofthetwmstroke cycle degree of effieien'cy withr'elatively low-1 cost- -vdescribed anclfclziirhecl, and illustrated 'inth'e Further obj eats oflny iinfention are to provide an engine of the character describedwherein a pair of conib'ustion chambers a e connected" at their upper orouter'ends by a common clearance space which pefrtfbr'ms the functionsof a common combustion and? expansion chamber to arrange beh'fin'tl and"in line with the co'm'lo'ustior "chambers a j gaseous fuel" pumpingcylinder," the axis of which is substantially parallelianclhlwthe sameplane with the axes ofthe' combustion cylinders; to arrange" oril-Yjone"sidebff the pumping, cylinder and laterally; with respect to the planeoccupied by the axes of" the combustion and pumping, cylinders acylinder and a pistonvalv'e thereinwhich piston Valvecontrols theadiniss'ionbfgaseous fuel into the umping:'eylindery fiw to actuate suchpiston valve fr'orn' a j s'ecrn'icl any: or: auXi-liar crank shaft thatis dr'i'ver'if atthe same speed as the; main cr'a'nk -shajft ofthe'engin'e and to which latter"tl1e"pistons" in the" combustioncylinders "and pumping! cylindersare connected."

l/V-ith the foregoing a'ncl'otherobjeetsln View, my; invention consistsin thefnovei; features of cons'tructmn and arrangemento'f -t th t .willbe hereinafter more" fiilljl accompanying.clrawingsein whichfe IFigure-1 is' aryertical section lengthwise through the center of anengine of IHYEIII'F' provecl' constructiony Figure 'is a ver linfe 2- 2of Figure. 1'; i

Figure 3;1sa"hor1zontal section taken ap proximately-on the line 3-3 ofli lguie 1;

, Figure 4 vis a detail sectlonal v 'ew show lll'gg the-transfer: ductfrom the pumping f cylinbler to 'the adjaeefitooinbustion cylirider: 1

Referring: by numeral's' to the accompany? 1 ing drawings, whichillustrate ax'prabticala embodiment of my invention; lO'fdesignates acy'llifdel' "='block which is preferably cast in a single piece andthewallsofwhieh are provided with connected chambers: 11', through whichmay be circulatekl a'j fi-u id cooling mediuin such as' water;torthepu'ripose ofdisseminating? theheat genera-ted! clui in g operationof the engine. V Formed in the cylinderb'lo'ok l of com'busti'onchanihers; 12 and lifi'rand a.

pumpingicharnber 14, said chambersi -beingj'l arranged: in a row withtheir axes; sub

stan'tiallyparallel ancl 'occupyingr thevsamer Plflli- Foll'hepuinpingbhainber14; is apiston ta l ve' cham-"a ber' 15 the axis ofwhich-is substantially parallel with the axis ofsaicl' pumping zchaniwberi' Secured-to the to'p of lolock 10'is -aw' through which maybecirculated fluid'ico'o'b ving medium, and? formed in the underside ofthis head and connecting the upper 'pon 'tio'n's of the combustionchambers" 12 ztnd 13,

is 'aicomnion clearance chamber 182 Y so Formed in "the u'nclersicle" ofheacl b1ock= 16; isa shallow chamber 19 thatisdispiosed substantially atri htangles "to the chaih'ber 718", and sa ic'l chamber *19"establishescom-= r Inunic'ation between pumping; chamber 14" '85 anlfpistonvalvechain lfii j v Leading from"the=end o f chamber 19-5 that:COIII'IIrLTHiGaES with -c1ian1'b'er 14, lSf an outlet: i

20 that communicates with a duet-"21; the lower end "of whichcommunicates f with an r in1tport -22'th ah is formed; inthelo'loolr10'- atapoi-nt intermediate the' ends f combus:. 1 tion chamber13. T HSeated in the central -p'o r'tion of block- 16 and preferably a bove'the '-'combustio chant-T" '-ber13-," is an iignitiorr clewice; such as aspark plug-'23 fan c'l the terminals of the electrodes thereof'projectinto the chamber I83 v Formed through the wall of fb'lock "10 imthe same horizontal pla 1e-' with port 22;" is: 7 an" exhaust port "QPth'at-leads from the in Arranged" beneaththefblock 10 is a Suit d insa-i'cl block *10, to one side of the; 70 i ,mately at the halfway pointon itsdoWn- I ward stroke, and as thepiston valve .36

f moveslu'pward, inlet port 38 isclosed, and on i the succeedingupwardrstrokeofpumping I piston. 32, the gaseous fuel charge drawn intoably formed crank case 25, having bearings V 26 in its, ends for a crankshaft 27, and-the flatter being provided with two cranks 28 vand 29.These cranks are oppositely disposed or arranged approximately 180degrees apart, and crank 28, which is approxi mately twice the length ofcrank 29, but with the same radius of throw, is located beneath chambers'12 and 13, while crank,2 9"is 10-;

cated beneath chamber 14.

Arranged for reciprocatory movement within chambers 12 and 13 arepistons and 31 respectively and these pistons are connected by ordinaryconnecting rods 32 -to crank--28.- i a '7 A pumping 'piston32 isarranged for operj *ation within chamber'l4 and a connectingrod-33connects said piston with crank 29.

Arranged for rotation in suitable bearings in the crank case 25, is asecondary crank {shaft 34,"the axis of which is parallel with "the axisof crank shaft 27 and this-secondarycrank shaft is directly connected to"the-said crankshaft-27, so as ,to rotateiit the same speed bymeshingpinions 35, as

shown,'or bysprocket wheels and a'chain,

i The crankshaft 34 is arranged beneath the piston valve cylinder 15 andarranged for operation. Within the latter is" a piston; yalve 36, thesame being connected to the 1 cranki of shaft 34 by a connecting rod 37Formedthrough the wall of the, cylinder 7 "I I "block that-surroundschain 15, is a gaseous Qfuel inletport- 38, the latter being arranged sothat it is wholly open when piston valve 36 isfat the lower end of itsstroke. I The operation ofmy improved engine is I It follows: a 1

1 V 3 -While piston. valve is at the lower end 40 of its stroke, acharge, of gaseous fuel enters chamber1'5'through openport38 and thischarge'of gaseousfuel also fills chamber 19 and the pumping chamber 14;At the time the piston valve 36 is at the lower end of its stroke,pumping piston 32 isvapprox the chambers 14 and 15' will be compressedthereinland alsoin the=connecting chamber 19 andin the duct. 21.--

V Pistons 30 and :31 move *gether followingignition of a compresseddownward togaseousfuel charge-in. the common chamber 18*andthe upperportions of chambers 12- "and 13, and as said pistons approach and ljpass'low center, or the-lower ends of their ,travel, inlet port'22 andexhaust port 24 will 0 en,, so that the compressed gaseous fuel car'gewill pass from duct 21, through port 22,.into and through chamber13, thereby f drivinglbefore it, the products ofcombustion from .t

e previously ignited charge, and said products of combustion, or thegreater portion thereof, will be forced out through exhaust port 24 aslong as the sameis open.

As piston 30 starts on its upward or inward movement, ports24 and 22 areclosed,

"31 pass their high centers, the compressed charge will be fired byaspark produced beand ,as the pistons 30 and 31 continue their tween theterminals of the electrodes or spark plug 23.

' As the compr'essedcharge is thus ignited,

the relatively highpressure following combustion will drive the pistons30 and 31 downward on their power stroke.

Thus it will be seen that I have, provided a relativelysimple twostroke'cycle internal combustion engine, having twin power cylinders, agaseous fuel pumping cylinder, said three cylinders being arranged in arow and a gaseous fuel inlet controlled piston valve that is arrangedlaterally of the pumping pistons and which piston valve is operated fromcrank shaft that is driven directly from the main crank shaft of theengine,

and which arrangement provides a very compact structure-that may beeconomically operated in point of fuel consumption.

7 It is obvious'that constructionof the 'en-' gine, as herein shown anddescribed, may

bemodified in minor details without departioo ing from the spirit of myinvention, the

scope of which is set forth in the appended claimp I claim as myinvention: 7 A two stroke cycle internal internal combustion engine unitof four cylinders, two of the cylinders being joined by a singlecompressi o'n and combustion clearance chamber that is 'formedlengthwise parallel with the axes of the crank shaft, exhaust ports inone of the two cylinders that are joined by the s 7 single clearancechamber, inlet ports formed in the wall of the outer one of the twocylinders that are joined by the single clearance chamber, a chargepumping cylinder,.a piston valve cylinder, inlet ports formed in thewallof said piston valve cylinder, asingle COIIIPIBSSl OIIclearancechamber joining said pump cylinder and the piston valvecylinder, the piston valve'cylinder beingdisposed to the side of andparallel with the pumping cylinder, the compression clearance chamberthat joins the pump cylinder and the'pistontvalve cylinder extendinglaterally with respect to the plane-occupied by the row of threecylinders, a separate crank shaft fordriving'the piston valve,enginespeed actuated driving means between the main a duct extending from oneend of the lateral clearance chamber, that joins the pistonvalvecylinder to said pump cylinder, to an inlet port formed in one of thecombustion cylinders arranged in the row .of three cylinders, a separateconnection between each of the pistons in the comhusti'on cylinders andthe charge volume pumping cylinder and the main crank shaft and saidmain crank shaft having a separate bearing periphery for eachconnection.

In testimony WhereofI aflix my signature.

EVERETT R. BURTNETT F-

